Hope a 5.0 answers also...
I"m a slow footed 4.0, so I won't satisfy your needs. Very little pickup tennis in the NBerkeley area, and UCBerk is still on summer break.
If you get real desperate, RoseGarden courts in Euclid and Eunice has pickup doubles that sometimes get 4.5 level players, but not a sure thing.
5.0 here is UCBerkeley level tennis, able to play and hang at A/Open and Qualifier/Futures, way out of my ability.